From: Jiri Pirko <jiri@xxxxxxxxxxx>
Date: Wed, 12 Apr 2017 17:13:03 +0200
> Wed, Apr 12, 2017 at 05:06:48PM CEST, dsa@xxxxxxxxxxxxxxxxxxx wrote:
>>On 4/12/17 6:34 AM, Johannes Berg wrote:
>>> diff --git a/include/uapi/linux/netlink.h b/include/uapi/linux/netlink.h
>>> index b2c9c26ea30f..7df88770e029 100644
>>> --- a/include/uapi/linux/netlink.h
>>> +++ b/include/uapi/linux/netlink.h
>>> @@ -69,6 +69,10 @@ struct nlmsghdr {
>>> #define NLM_F_CREATE 0x400 /* Create, if it does not exist */
>>> #define NLM_F_APPEND 0x800 /* Add to end of list */
>>>
>>> +/* Flags for ACK message */
>>> +#define NLM_F_CAPPED 0x100 /* request was capped */
>>> +#define NLM_F_ACK_TLVS 0x200 /* extended ACK TVLs were included */
>>> +
>>> /*
>>> 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
>>> 4.4BSD CHANGE NLM_F_REPLACE
>>> @@ -101,6 +105,33 @@ struct nlmsghdr {
>>> struct nlmsgerr {
>>> int error;
>>> struct nlmsghdr msg;
>>> + /*
>>> + * followed by the message contents unless NETLINK_CAP_ACK was set
>>> + * or the ACK indicates success (error == 0)
>>> + * message length is aligned with NLMSG_ALIGN()
>>> + */
>>> + /*
>>> + * followed by TLVs defined in enum nlmsgerr_attrs
>>> + * if NETLINK_EXT_ACK was set
>>> + */
>>> +};
>>> +
>>> +/**
>>> + * enum nlmsgerr_attrs - nlmsgerr attributes
>>> + * @NLMSGERR_ATTR_UNUSED: unused
>>> + * @NLMSGERR_ATTR_MSG: error message string (string)
>>> + * @NLMSGERR_ATTR_OFFS: offset of the invalid attribute in the original
>>> + * message, counting from the beginning of the header (u32)
>>> + * @__NLMSGERR_ATTR_MAX: number of attributes
>>> + * @NLMSGERR_ATTR_MAX: highest attribute number
>>> + */
>>> +enum nlmsgerr_attrs {
>>> + NLMSGERR_ATTR_UNUSED,
>>> + NLMSGERR_ATTR_MSG,
>>
>>There was a discussion about side effects of adding strings (bloat,
>>internationalization). Should ATTR_MSG be removed until that is ironed
>>out? Leaving it in suggests it is ok to start adding strings.
>
> I believe that we need strings right away. Without them, this patchset
> really does not make much sense.
Agreed.
